Digital Information
Which can be represented by 4 bits in binary?
a) Pi
b) The number of days in March
c) The population of Newnan
d) Unlucky number 13
d) Unlucky number 13
You cut a fiber line while digging. Internet traffic is still possible because of:
a) bandwidth
b) protocols
c) redundancy
d) latency
c) redundancy
An example of input and output in a program:
a) i: ask for feedback, o: get suggestions
b) i: put money in machine, o: get a soda
c) i: a user clicks a button, o: a sound is played
d) i: study hard, o: make good grades
c) i: a user clicks a button, o: a sound is played
The variable isOn is used to indicate whether a light is on or off. Which is the best data type for isOn?
a) Boolean
b) number
c) string
d) list
a) Boolean
The list is indexed starting at 1.
var myNumbers = [2, 0, 10, 1, 16]
What is the value of myNumbers[2]?
a) 2
b) 0
c) 10
d) 1
b) 0
a) 7
b) 13
c) 14
d) 15
c) 14
What is the relationship between the world wide web and the internet?
a) the www is a protocol accessed from the internet
b) the www is a network accessed over a protocol called the internet
c) the www is a system of linked pages and files accessed over a data stream called the internet
d) the www is a system of linked pages and files accessed over a network called the internet
d) the www is a system of linked pages and files accessed over a network called the internet
You are using the Uber app. What is LEAST likely to be input from you as the user?
a) the cost of your ride
b) your current location
c) your destination
d) your payment information
a) the cost of your ride
What is the value of score after running this?
score = 1;
score=score+3;
score="the score is " + score
a) 3
b) 4
c) the score is 3
d) the score is 4
d) the score is 4
This list is indexed starting at 1
colors="pink", "red", "orange"
colors="blue", "green", "violet"
display colors[1]
What is displayed?
a) pink
b) red
c) blue
d) green
c) blue
How many values can you represent with 8 bits?
a) 7
b) 8
c) 128
d) 256
d) 256
How are messages sent over the internet?
a) They are broken into packets which must be sent and received in order
b) They are broken into packets which can be received in any order
c) They are broken into two packets - the metadata and the message
d) They are sent as a single file
b) They are broken into packets which can be received in any order
One thing that does NOT help collaboration in app development
a) planning an app together
b) writing code independently, then combining it in the end
c) asking for input from potential users
d) asking friends for feedback
b) writing code independently, then combining it in the end
What is displayed is score=3 and lives=1?
If lives=0
display "you lose!"
Else if score > 5 and lives=3
display "Perfect!"
Else
display "you win!"
a) you lose!
b) Perfect!
c) you win!
d) NaN
c) you win!
names.append "jack"
names.remove "eve"
display names.length
What is displayed?
a) eve
b) 5
c) 4
d) 3
d) 3
a) 7
b) 8
c) 127
d) 128
c) 127
Why use protocols?
a) to ensure your data transmission is secure
b) to specify in advance how data is routed
c) to ensure all users have equal bandwidth
d) to standardize transmission between devices
d) to standardize transmission between devices
A good reason to have a diverse team working on an app:
a) avoid writing comments
b) eliminate software testing
c) reach the needs of many users
d) no need for documentation
c) reach the needs of many users
What is displayed?
var day = "Saturday"
If day="Saturday" or day="Sunday
weekend();
Else
weekday();
function weekend
display "Hooray!"
function weekday
display "Bummer!"
a) weekend
b) weekday
c) Hooray!
d) Bummer!
c) Hooray!
What is the most important quality of lossless compression?
a) the transformed data is always smaller than the original
b) The compressed data can always be reconstructed to the original
c) The lost data can't be perceived by human eyes/ears
b) The compressed data can always be reconstructed to the original
Which binary number represents the decimal (base 10) number 64?
a) 0100 0000
b) 0111 1111
c) 1000 0000
d) 0000 1111
a) 0100 0000
Which is a likely problem due to the digital divide?
a) voter registration forms are available only online
b) you use an image on the internet without attributing the creator
c) libraries provide free internet access
d) packets arrive out of order
a) voter registration forms are available only online
Which would result in a better digital representation of an image?
a) less frequent sampling/larger sample squares
b) more frequent sampling/smaller sample squares
c) using decimal numbers to represent each pixel
d) using fewer bits to represent the image
b) more frequent sampling/smaller sample squares
var x = ""
function saySomething
display "Hello"
Hello is never displayed. Why?
a) x has no value
b) x does not have a meaningful name
b) saySomething is defined and called
c) saySomething is defined but not called
c) saySomething is defined but not called